What is a transistor and how does it work in layman’s terms?

In Electrical & Electronics the following  things are also variable resistors
 
1. Rheostat        –     Resistance is changed by  manually controlling
2. Inductor         –      Resistance is changed by  changing the frequency
3. Capacitance  –      Resistance is changed by  changing the frequency.
4. Thermiser      –     Resistance is changed by  changing the Temperature
5. Transistor (BJT) –  Resistance is changed by  changing the base current
6. Transistor (FET) – Resistance is changed by  changing the Gate voltage.
7. Photo Transistor – Resistance is changed by  changing the light

What is a transistor and how does it work in layman's terms?

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